Population genetic analysis reveals a geographically limited transition zone between two genetically distinct Atlantic salmon lineages in Norway

Ecology and Evolution
Vidar WennevikKevin A Glover

Abstract

Atlantic salmon is characterized by a high degree of population genetic structure throughout its native range. However, while populations inhabiting rivers in Norway and Russia make up a significant proportion of salmon in the Atlantic, thus far, genetic studies in this region have only encompassed low to modest numbers of populations. Here, we provide the first "in-depth" investigation of population genetic structuring in the species in this region. Analysis of 18 microsatellites on >9,000 fish from 115 rivers revealed highly significant population genetic structure throughout, following a hierarchical pattern. The highest and clearest level of division separated populations north and south of the Lofoten region in northern Norway. In this region, only a few populations displayed intermediate genetic profiles, strongly indicating a geographically limited transition zone. This was further supported by a dedicated cline analysis. Population genetic structure was also characterized by a pattern of isolation by distance. A decline in overall genetic diversity was observed from the south to the north, and two of the microsatellites showed a clear decrease in number of alleles across the observed transition zone. Together, these ana...Continue Reading

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Citations

Dec 12, 2019·Royal Society Open Science·A C HarveyV Wennevik
Jun 9, 2020·BMC Genetics·K A GloverM F Solberg
Jul 10, 2020·BMC Genetics·Tom Johnny HansenPer Gunnar Fjelldal
Oct 16, 2020·Nature Communications·Alicia C BertolottiDaniel J Macqueen
Nov 5, 2020·Journal of Evolutionary Biology·Ksenia J ZuevaVictoria L Pritchard

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Methods Mentioned

BETA
genotyping
PCA

Software Mentioned

STRUCTURE
BOTTLENECK
GenoDive
R Package “ Kendall
PASSaGE
ParallelStructure
R
GENEPOP
PGDSpider
CLUMPP

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